I discovered yesterday that the wires on my Voltage regulator were bad on my 1984 Mercury 115HP. I am not getting any fire from my spark plugs. Would this be the cause? Also, I replaced the impeller and reinstalled the lower unit. Now it will not go in neutral even though my throttle is in neutral. Would this be the cause of the spark plugs not firing. I've heard I don't necessarily need the voltage regulator for it to fire and that it was for charging the battery etc...